Ratios and Proportions
Expressing Proportions
Proportions
express Equality
between Two Ratios.
Setting up the Proportion
When two Ratios
share the same relationship,
the proportion of the
first Ratio is the
same as the the proportion
of the second Ratio.
The mathematical formula showing the
Equal Proportion is
1
:
2
::
2
:
4
The mathematical formula is read as
1
IS TO
2
AS
2
IS TO
4
More examples of
Proportions
2
:
3
::
12
:
18
2
IS TO
3
AS
12
IS TO
18
1
:
4
::
8
:
32
1
IS TO
4
AS
8
IS TO
32
3
:
10
::
15
:
50
3
IS TO
10
AS
15
IS TO
50